Iron-boron alloy



Patented Nov. 1711925.

mania racz, or-nas'r cmavnmmn, oruo, assrenon ro sem nar. annc'rnxc cou- IPANY, A CORPORATION 01' NEW YORK.

mon-nonon ALLOY.

No Drawing- To all whom it may concern:

Be it knownthat I, ALADAR Paoz, a citizen of the United States, residing at East Cleveland, .in the county of uyahoga, State of Ohio, have invented certain new and useful Im rovements in Iron-Boron Alloys, of whic -the following is a specification.

My invention relates to metals for easting and more specifically to such metals consisting principallyof iron. The object of my invention'is to rovide a metal which will possess the g casting qualities of cast iron and at the same time ossess higher tensile strength greater omogeneity and better adaptabllity for working than cast iron.

My invention consists in incorporating with the iron a small percentage. of boron. Although there are disclosures in the prior art ofthe use of boron in connection with iron and steel, they have had little efiect on the iron and steel industry. I believe that I am. the first to recognize in the combination of boron with iron, the especial advantages for casting which it ossesses over cast steel, and, at .the same-time, the

85 i On the other hand, it may be forged and 'highertensile strength and workability which it possesses over cast iron.

My invention provides metal which has a higher tensile strength han that of cast iron and even higher thanthose of semisteel or. malleable cast iron. It machines like soft cast iron and more easily than steel because of its lack of ductilityas cast.

drawn since it acquires ductility byworking. Its low melting point, whlch may be varied by the addition of greater or lesserpercentages of boron, and which in some cases is' lower than that of cast iron, is of great advantage on account of greater fluidity of the molten metal and also less shrinkage of castings. On account of its higher tensile strength. articles can be made of smaller dimensions than if cast iron were employed. Another feature of my inven tion is that the castings made from this metal do not chill, and therefore the metal is particularly adaptable for casting in metal molds. ,On account of its. com aratively finegrained structure and uni ormity, with absence of blow-holes, the metal does not warp like cast iron, nor is it so .porous. The use of my metal for castings through Application filed March 7, 1922. Serial No. i331.

reduces the number of re'ections on account of defects as compare When machined, the metal takes a very smooth finish. Thefelasticity is much higher than that of cast iron.

The abovestated properties render mymetalespecially suitable forpiston rings, pistons, engine valves, cylinders for internal combustion and otherengines, molds, dies, pum parts, and many of the other uses tow ich cast iron and cast steel are now put.

teen to twenty per cent .of boron. The percentage of carbon in the steel scrais im-.

portant because the hardness of t e final roduct will depend largely upon its carwith cast iron.

'I have found it desirable to incorporate I poun s of ferro-boron, containing from six Y 11 content. The ferro-boron which I. re-

fer'to use is that produced by the alummothermic method, as set forth'in my application, Serial No. 294,456, filed Ma 3, 1919, although, I do not restrict'myse f to this source of boron. The metal produced with the above stated roportions of materials had 'a melting polnt slightly higher than "that of cast iron. It'had a tensile strength of fromsixty-seven thousand pounds per square inch. It was forged at a red heat and this. raised the tensile strength to about one hundred five thousand pounds per I cent.

Tensile strengths u wards of fift thousand ounds may he readil o tained my invention. The car on content may vary although I prefer tohave less than one-half per cent carbon present; What I claim as new and desire to secure by Letters Patent of the United States, is: '1. A casting, consisting redominantly of iron with from three-fourt hs to four 'per cent of boron, and havinga tensile strength upwards of fifty thousand pounds per square inch.

square inch with an elongation of six per 2. A chilled casting, consisting predominantly of iron, with from three-fourths to four per cent of boron, and having a tensile strength upwards of fifty thousand pounds per square inch. r l v 3; A cast alloy having a tensile strength upwards of fifty-thousand pounds per s uare' inch and consisting predominantly o iron,less than one-half per cent carbon, 10 and three-fourths to four per cent boron.

- 4. A cast iston ring composed of an alloy containing mostly iron, with threefo'urths to four per cent boron. v I I 5." A cast piston ring composed of an alloy containing mostly iron, with threefourths to four per cent boron, and less than one-half per cent carbon.

In witness whereof, I havehereunto set my hand this 3rd day of March 1922.

. ALADAR PACZ. 

